Ctenocephalides felis, commonly known as the cat flea, is a small, wingless insect that primarily infests cats and dogs. These fleas are about 1-3 mm long and have a flattened body, allowing them to move easily through fur. They feed on the blood of their hosts, which can lead to irritation and allergic reactions in pets. The life cycle of Ctenocephalides felis includes four stages: egg, larva, pupa, and adult. Adult fleas can reproduce rapidly, laying hundreds of eggs in their lifetime. Control measures often involve treating pets with topical or oral medications, as well as cleaning the environment to eliminate eggs and larvae.